摘要
为了探明紫外光和光氧化剂对卤烃光降解的影响 ,以 H2 O2 和 H2 O2 /草酸铁络合物为光氧化剂 ,研究了紫外光对氯仿、三氯乙烯和四氯乙烯的降解 .结果表明 ,紫外光、紫外光 / H2 O2 体系能有效地加速水溶液中三氯乙烯和四氯乙烯的光降解 ,但不能降解氯仿 ;而紫外光 / H2 O2 /草酸铁或紫外光 /草酸铁络合物体系能有效地使水溶液中氯仿、三氯乙烯和四氯乙烯烃迅速光解脱氯 ;溶液 p H值对卤烃光解有显著影响 ,p H值为 2 .5～ 3.5时光解速率最快 .随着 H2 O2 质量浓度的增加 ,卤烃光解速率提高 ,但 H2 O2 增大到一定质量浓度时 。
The photo degradation of chloroform, trichloroethylene and tetrachloroethylene by H 2O 2 and H 2O 2 ferrioxalate complexes as photo oxidants under irradiation of UV was compared. The results show that the photodegradation of two kinds of chloroethylene in aqueous solution by UV, UV/ H 2O 2 is very effective;the photodegradation of chloroform by the photo oxidants is not obvious;the photodegradation of three kinds of chloronated hydrocarbons by UV/ H 2O 2 /ferrioxalate or UV/ferrioxalate complexes is very significant. pH has significant effects on the photo degradation of halogenated hydrocarbons and the highest rate of photo degradation happens at pH 2.5~3.5. The rate of photo degradation of halogenated hydrocarbons increases with the rice of H 2O 2 concentration, but the amount of dechloridation decreases when the concentration of H 2O 2 reaches a certain level.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第2期130-133,共4页
Journal of Hunan Agricultural University(Natural Sciences)
